Apparatus for fashioning rotary members having angularly spaced portions of like peripheral contour



March 23, 1954 5, G BRADY 2,672,713

APPARATUS FOR FASHIONING ROTARY MEMBERS HAVING ANGULARLY SPACED PORTIONS OF LIKE PERIPHERAL CONTOUR Filed May 8, 1950 INVENTOR.

SAMUEL G. BRADY BY W NWfiM ATTORN IEYS Patented Mar. 23, 1954 APPARATUS FOR FAS MEMBERS HAVING HIONIN G ROTARY AN GULARLY SPAOED PORTIONS OF LIKE PERIPHERAL C ON- TOUR Samuel G. Brady, Royal Oak, The Gear Grinding Machine Mich., assignor to Company, Detroit,

M1ch., a corporation of Michigan Application May 8, 1950, Serial No. 160,708

1 Claim.

The invention relates to the forming of cylindrical bodies having a fluted or splined contour, and it is the primary object of the invention to expedite the work of fashioning the same.

One method which has heretofore been employed for forming such splines or flute is to fashion a cutter such, for instance, as a rotary grinder wheel to a corresponding cross sectional contour and then to relatively reciprocate said grinder wheel and work axially of the latter, while at the same time progressively feeding them towards each other. After one flute is completed the work is indexed and the operation is repeated. With my improved method the cutter simultaneously registers with a plurality of the flutes but is fashioned to the complete contour of only one of these, the other portions being only partial. If, however, the work is periodically indexed to advance the same in the direction of the full contour, the operation will be expedited as stock will be removed progressively by the portions of the cutter of partial contour leaving less to be removed by the full contour portion.

The invention therefore consists in the apparatus as more fully hereinafter set forth.

In the drawings:

Fig. 1 represents a portion of a rotary work piece having a fluted contour with the cutter in engagement therewith;

Fig. 2 is a side elevation of the cutter with the work in section and broken away into different planes.

A is the rotary work piece such as a cylinder to be fluted, and B is a rotary grinder wheel, these members being mounted (by means not shown) for relative reciprocation axially of the work. The grinder wheel B has a portion C thereof which is of the contour of the completed flute and which is symmetrical with a radial line D-D extending therethrough from the center of the work. Adjacent to the portion C is a portion C" which is symmetrical with a line ED but does not extend into the work to the full depth of the portion C. Adjacent to the portion C tion C symmetrical with a line F--D and which extends into the work a lesser distance than the portion C. While I have only shown the grinder wheel as having the three portions C, C and C it is obvious that this number might be increased if desired so as to have a smaller differential between the same.

In operation the grinder wheel and work are relatively reciprocated, as above described, and at the start the grinder wheel is gradually fed into the work until the portion C is to the full radial depth. The portions C and C will have been simultaneously fed into the work but to a progressively decreasing depth. The work is then indexed to bring the portion thereof fashioned by the grinder portion C in registration with the grinder portion C, and this will also register the work portion fashioned by the grinder portion C. into registration with a grinder portion C. Thus, in the further relative reciprocation of the work and grinder wheel, another flute will be completed by the grinder portion C, and the grinder portion (3 will initiate the forming of the flute in a portion of the work not previously in contact with the grinder wheel.

It is obvious that the time required for completing the operation will be diminished in proportion to the number of portions of the grinder wheel which are simultaneously in contact with the work. It will be also understood that each of these portions is symmetrical with the radial center line of the flute to be formed thereby so as to remove substantially equal amounts of stock by all portions of the contour.

While I have specifically described the cutting tool as a grinder wheel, it is obvious that other cutters might be used in place thereof to carry out my improved method.

What I claim as my invention is:

In an apparatus for form grinding cylindrical work blanks to fashion the same with equally angularly spaced indented portions of like contour, said apparatus including a grinder wheel spindle extending transverse to the axis of the work mounted for relative reciprocation along said axis and means for periodically indexing the work; a grinder wheel mounted on said spindle having an integral body extending axially into operative relation to a plurality of successive angularly spaced portions of the work and being trimmed to have portions of dissimilar contour simultaneously registering with said successive portion and penetrating the same to progressively increasing radial depths, the contour of each of said portions being symmetrical with respect to a radial center line of the portion of the work with Which it is in registration.

SAMUEL G. ERADY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,545,070 Sears July 7, 1925 1,753,096 S-narry Apr. 1, 1930 1,759,333 Wildhaber May 20, 1930 1,955,082 Miller Apr. 17, 1934 FOREIGN PATENTS Number Country Date 51,857 Germany May 2, 1890 533,736 Germany Sept. 19. 1931 

